package graphdriver // import "github.com/docker/docker/daemon/graphdriver" import ( "github.com/docker/docker/pkg/mount" "golang.org/x/sys/unix" ) const ( // FsMagicAufs filesystem id for Aufs FsMagicAufs = FsMagic(0x61756673) // FsMagicBtrfs filesystem id for Btrfs FsMagicBtrfs = FsMagic(0x9123683E) // FsMagicCramfs filesystem id for Cramfs FsMagicCramfs = FsMagic(0x28cd3d45) // FsMagicEcryptfs filesystem id for eCryptfs FsMagicEcryptfs = FsMagic(0xf15f) // FsMagicExtfs filesystem id for Extfs FsMagicExtfs = FsMagic(0x0000EF53) // FsMagicF2fs filesystem id for F2fs FsMagicF2fs = FsMagic(0xF2F52010) // FsMagicGPFS filesystem id for GPFS FsMagicGPFS = FsMagic(0x47504653) // FsMagicJffs2Fs filesystem if for Jffs2Fs FsMagicJffs2Fs = FsMagic(0x000072b6) // FsMagicJfs filesystem id for Jfs FsMagicJfs = FsMagic(0x3153464a) // FsMagicNfsFs filesystem id for NfsFs FsMagicNfsFs = FsMagic(0x00006969) // FsMagicRAMFs filesystem id for RamFs FsMagicRAMFs = FsMagic(0x858458f6) // FsMagicReiserFs filesystem id for ReiserFs FsMagicReiserFs = FsMagic(0x52654973) // FsMagicSmbFs filesystem id for SmbFs FsMagicSmbFs = FsMagic(0x0000517B) // FsMagicSquashFs filesystem id for SquashFs FsMagicSquashFs = FsMagic(0x73717368) // FsMagicTmpFs filesystem id for TmpFs FsMagicTmpFs = FsMagic(0x01021994) // FsMagicVxFS filesystem id for VxFs FsMagicVxFS = FsMagic(0xa501fcf5) // FsMagicXfs filesystem id for Xfs FsMagicXfs = FsMagic(0x58465342) // FsMagicZfs filesystem id for Zfs FsMagicZfs = FsMagic(0x2fc12fc1) // FsMagicOverlay filesystem id for overlay FsMagicOverlay = FsMagic(0x794C7630) ) var ( // List of drivers that should be used in an order priority = "btrfs,zfs,overlay2,aufs,overlay,devicemapper,vfs" // FsNames maps filesystem id to name of the filesystem. FsNames = map[FsMagic]string{ FsMagicAufs: "aufs", FsMagicBtrfs: "btrfs", FsMagicCramfs: "cramfs", FsMagicEcryptfs: "ecryptfs", FsMagicExtfs: "extfs", FsMagicF2fs: "f2fs", FsMagicGPFS: "gpfs", FsMagicJffs2Fs: "jffs2", FsMagicJfs: "jfs", FsMagicNfsFs: "nfs", FsMagicOverlay: "overlayfs", FsMagicRAMFs: "ramfs", FsMagicReiserFs: "reiserfs", FsMagicSmbFs: "smb", FsMagicSquashFs: "squashfs", FsMagicTmpFs: "tmpfs", FsMagicUnsupported: "unsupported", FsMagicVxFS: "vxfs", FsMagicXfs: "xfs", FsMagicZfs: "zfs", } ) // GetFSMagic returns the filesystem id given the path. func GetFSMagic(rootpath string) (FsMagic, error) { var buf unix.Statfs_t if err := unix.Statfs(rootpath, &buf); err != nil { return 0, err } return FsMagic(buf.Type), nil } // NewFsChecker returns a checker configured for the provided FsMagic func NewFsChecker(t FsMagic) Checker { return &fsChecker{ t: t, } } type fsChecker struct { t FsMagic } func (c *fsChecker) IsMounted(path string) bool { m, _ := Mounted(c.t, path) return m } // NewDefaultChecker returns a check that parses /proc/mountinfo to check // if the specified path is mounted. func NewDefaultChecker() Checker { return &defaultChecker{} } type defaultChecker struct { } func (c *defaultChecker) IsMounted(path string) bool { m, _ := mount.Mounted(path) return m } // Mounted checks if the given path is mounted as the fs type func Mounted(fsType FsMagic, mountPath string) (bool, error) { var buf unix.Statfs_t if err := unix.Statfs(mountPath, &buf); err != nil { return false, err } return FsMagic(buf.Type) == fsType, nil }